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144 results for “Leporinus”
Fig. 1. Sampling area. 1 in Population structure, growth and fishery yield of Leporinus acutidens (Valenciennes, 1837) (Teleostei: Anostomidae) in Yacyretá Reservoir (Argentina)
Fig. 1. Sampling area. 1- Yabebiry Stream; 2- Nemesio Parma; 3- Puerto Valle, 4- Puerto Júpiter.
Fig. 6 in Population structure, growth and fishery yield of Leporinus acutidens (Valenciennes, 1837) (Teleostei: Anostomidae) in Yacyretá Reservoir (Argentina)
Fig. 6. Monthly average condition factor (K) by sex for L. acutidens.
Fig. 2 in Swimming performance of the migratory Neotropical fish Leporinus reinhardti (Characiformes: Anostomidae)
Fig. 2. Number of tested fish per total length classes used to determine prolonged speed.
Fig. 1 in Feeding aspects of Leporinus amblyrhynchus (Characiformes: Anostomidae) in the first stages of formation of a Neotropical reservoir, Brazil
Fig. 1. Location of the study area in the rio Corumbá (a) and reservatório de Corumbá (b), GO.
Speciation in coastal basins driven by staggered headwater captures: Dispersal of a species complex, Leporinus bahiensis, as revealed by genome-wide SNP data
<p>Past sea level changes and geological instability along watershed boundaries have largely influenced fish distribution across coastal basins, either by dispersal via palaeodrainages now submerged or by headwater captures, respectively. Accordingly, the South American Atlantic coast encompasses several small and isolated drainages that share a similar species composition, representing a suitable model to infer historical processes. <em>Leporinus</em> <em>bahiensis</em> is a freshwater fish species widespread along adjacent coastal basins over narrow continental shelf with no evidence of palaeodrainage connections at low sea level periods. Therefore, this study aimed to reconstruct its evolutionary history to infer the role of headwater captures in the dispersal process. To accomplish this, we employed molecular-level phylogenetic and population structure analyses based on Sanger sequences (5 genes) and genome-wide SNP data. Phylogenetic trees based on Sanger data were inconclusive, but SNPs data did support the monophyletic status of <em>L. bahiensis</em>. Both COI and SNP data revealed structured populations according to each hydrographic basin. Species delimitation analyses revealed from 3 (COI) to 5 (multilocus approach) MOTUs, corresponding to the sampled basins. An intricate biogeographic scenario was inferred and supported by Approximate Bayesian Computation (ABC) analysis. Specifically, a staggered pattern was revealed and characterized by sequential headwater captures from basins adjacent to upland drainages into small coastal basins at different periods. These headwater captures resulted in dispersal throughout contiguous coastal basins, followed by deep genetic divergence among lineages. To decipher such recent divergences, as herein represented by <em>L. bahiensis </em>populations, we used genome-wide SNPs data. Indeed, the combined use of genome-wide SNPs data and ABC method allowed us to reconstruct the evolutionary history and speciation of <em>L. bahiensis</em>. This framework might be useful in disentangling the diversification process in other neotropical fishes subject to a reticulate geological history. </p>
Speciation in coastal basins driven by staggered headwater captures: Dispersal of a species complex, Leporinus bahiensis, as revealed by genome-wide SNP data
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Data from: Dealing with allometry in linear and geometric morphometrics: a taxonomic case study in the Leporinus cylindriformis group (Characiformes: Anostomidae) with description of a new species from Suriname
To achieve maximum efficacy, taxonomic studies that seek to distinguish amongst species must first account for allometric shape variation within species. Two recently developed software packages (SMATR and MorphoJ) offer regression-based allometric approaches that are notable for their statistical power and ease of use and that may prove highly useful to taxonomists working with linear or geometric morphometric data. We investigate species delimitation of the slender-bodied fishes in the Leporinus cylindriformis group using these programs and demonstrate the utility of the allometric corrections that they provide. Without allometric correction, many pairs of species are difficult to distinguish on the basis of morphometrics, but once regressions are used to account for marked allometric variation within species, most of the recognized species in this group can be readily distinguished with linear or geometric morphometrics, particularly using variation in the depth of the body. Both approaches returned congruent patterns of separation amongst putative species, but the geometric approach in MorphoJ distinguished amongst four more pairs of species than did the linear approach in SMATR and appears to provide slightly more statistical power. Based on distinctive morphometrics, meristics, and coloration, a highly elongate species of Leporinus from the Suriname, Corantijn, and Coppename rivers of Suriname is described herein as a new species, Leporinus apollo sp. nov. The unique L. cylindriformis holotype from Porto de Moz, Brazil differs in morphology, meristics, and pigmentation from specimens commonly referred to that species from the main basin of the Amazon; the latter specimens may represent an additional undescribed species. The L. cylindriformis holotype itself may represent a rare species or a specimen collected at the edge of its native range. Measurements of the holotype and paratype of Leporinus niceforoi, which were collected in the Amazonian slope of Colombia, differ substantially from similarly pigmented and putatively conspecific specimens from Amazonian portions of Ecuador and Peru. Recently collected specimens from Colombia are needed to determine whether the observed morphometric variation encompassed by the current concept of L. niceforoi indicates a morphocline within a single species, suggests the presence of multiple cryptic species, or results from shrinkage of the types. In all these cases, linear or geometric morphometric data can reliably differentiate amongst species, but only after one accounts for allometric shape variation. The new SMATR and MorphoJ software packages both offer easy and effective approaches to such allometrically informed taxonomy, and may prove useful to any systematist working on taxa that change shape as they grow.
FIGURE 2. Leporinus amazonicus n in Leporinus amazonicus, a new anostomid species from the Amazon lowlands, Brazil (Osteichthyes: Characiformes)
FIGURE 2. Leporinus amazonicus n. sp., lateral view of a freshly collected specimen (INPA 22863, paratype, 97 mm SL).
FIGURE 4 in Leporinus amazonicus, a new anostomid species from the Amazon lowlands, Brazil (Osteichthyes: Characiformes)
FIGURE 4. Lateral view of the teeth of Leporinus amazonicus n. sp. (INPA 22860, 218 mm SL, paratype).
FIGURE 7 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 7. Jaws of Leporinus torrenticola, MZUSP 110624, 118.0 mm SL, rio Xingu basin. Scale bar 0.5 mm.
FIGURE 9 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 9. Hypomasticus megalepis (a), MZUEL 10200, 97.1 mm SL, rio Pitinga, tributary of rio Uatumã; H. julii (b), MNRJ 34057, c.140 mm SL, rio Xingu near Altamira.
FIGURE 4 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 4. Distribution of Leporinus multimaculatus (circles) and L. torrenticola (squares). Open symbols represent type localities.
FIGURE 3 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 3. Jaws of Leporinus multimaculatus, MZUSP 83997, 91.0 mm SL, rio Tocantins basin. Scale bar 0.5 mm.
FIGURE 5 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 5. Leporinus torrenticola: (a) LIA uncatalogued, 36.3 mm SL, rio Xingu near Altamira; (b) MNRJ 34071, 92.9 mm SL, holotype, rio Curuá, Xingu river basin; (c) INPA 31011, 89.3 mm SL, rio Xingu at Cachoeira do Espelho, basin. Scale bars 10 mm.
FIGURE 2 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 2. Leporinus multimaculatus: (a) MZUSP 91809, 72.5 mm SL, rio Culuene, rio Xingu basin (photo by Leandro Sousa); (b) MZUSP 114360, 63.9 mm SL, rio Muquem, rio Tocantins basin; (c) MZUSP 103467, 85.5 mm SL, rio Jari. Scale bars 10 mm.
FIGURE 8 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 8. Leporinus torrenticola: (a) INPA 40082, 63.5 mm SL, rio Xingu, above mouth of rio Iriri; (b) MZUSP 110624, 120.0 mm SL, rio Iriri, rio Xingu basin (photo by Mark Sabaj Pérez). Scale bars 10 mm.
FIGURE 1 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 1. Leporinus multimaculatus: (a) MZUSP 89940, 29.3 mm SL, rio Culuene, rio Xingu basin; (b) MCP 15921, 80.2 mm SL, rio do Peixe, rio Tocantins basin; (c) MNRJ 34080, 1, 92.6 mm SL, tributary of rio Fresco, rio Xingu basin; (d) MZUSP 119000, 87.4 mm SL, holotype, tributary of rio das Mortes, rio Araguaia basin. Scale bars 10 mm.
FIGURE 6. Leporinus torrenticola, MNRJ 34071, 92.9 in Two new species of Leporinus Agassiz, 1929 (Characiformes: Anostomidae) from tributaries of the lower Amazon basin in Brazil
FIGURE 6. Leporinus torrenticola, MNRJ 34071, 92.9 mm SL, rio Curuá, rio Xingu basin; holotype photographed live at the type locality.
FIGURE 10 in A systematic assessment of Leporinus tigrinus (Characiformes: Anostomidae) using morphological and molecular data
FIGURE 10. Partial map of South America showing the distribution of Leporinus tigrinus based on material examined in the present study.
FIGURE 9 in A systematic assessment of Leporinus tigrinus (Characiformes: Anostomidae) using morphological and molecular data
FIGURE 9. (A) Pectoral fin, (B) pelvic fin and (C) caudal fin of Leporinus tigrinus (MZUEL 20673, 112.0 mm SL)
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